But is a big help and save a lot of time because you realy have the tool what you need especial when you aré on the roof on steep leader u ser a kitchen sink etc etc sorry for my english.
Roof multi plier.
And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier.
A roof pitch multiplier also known as a roof pitch factor is a number that when multiplied by the area covered by a sloped roof gives the actual area of the roof.
The maths behind this number is that it is the square root of rise run 2 1.
The roof pitch multiplier is responsible for giving an accurate pitch measurement of the roof.
That gives you 5 590 square feet which is the actual area of the surface of the roof.
Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118.
A 2 b 2 c 2 where a is the rise of the roof b is the run of the roof and c is the rafter hypotenuse of the triangle with side lengths a and b.
And that s the number you were looking for.
Gerber mp600 multi plier needle nose black 47550 4 6 out of 5 stars 1 200.
This makes measuring easier knowing that you are able to get the exact measurement of roofs by merely standing on the ground.
Now solving for c in the equation above gives.